Place sweet potatoes in a Dutch oven; cover with water. Bring to a boil. Reduce heat; cover and simmer until tender, 20-30 minutes. Drain. When cool enough to handle, peel potatoes and cut into 1/4-in. slices. , Place half in a greased 2-1/2-qt. baking dish. Top with half of the cranberries, brown sugar and butter. Repeat layers. Pour orange juice over top. Cover and bake at 350° for 30 minutes. , In a small bowl, combine the walnuts, brown sugar and cinnamon; cut in butter. Sprinkle over sweet potato mixture. Bake, uncovered, until topping is golden brown, about 10 minutes longer.